Top cross beam structure reinforcer for improving low-frequency road noise of whole vehicle

Abstract

The utility model discloses a top cross beam structure reinforcer for improving low-frequency road noise of a whole vehicle, which comprises a mass block (1), a nylon framework (2) and structural adhesive (3), the nylon framework (2) covers the outer side of the mass block (1), and the structural adhesive (3) is arranged on the surfaces of the two sides of the nylon framework (2); compared with simple pre-tightening force attenuation when the mass block (1) is connected with a metal plate through a bolt, the risk of abnormal sound of the mass block (1) can be effectively avoided, meanwhile, the mass block (1) is installed at the position where the metal plate vibrates severely at low frequency, the mass block (1) is designed in a shape-following mode, and when the mass block passes through a bumpy road surface, the surface of the mass block (1) and the deformed metal plate generate dry friction abnormal sound, so that the mass block (1) is not damaged. The embedded mass block (1) structure reinforcer completely wraps the mass block (1) in nylon, and the epoxy resin structural adhesive (3) on the outer side wraps the surface of the nylon in a large area, so that large-area bonding between the embedded mass block (1) structure reinforcer and inner and outer metal plates of the top cross beam (10) can be realized, and local abnormal sound is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle technology. Specifically, this utility model relates to a top crossbeam structural reinforcement component that improves the low-frequency road noise of the whole vehicle. Background Technology

[0002] When a car is driving on a rough road surface, the low-frequency excitation of the road surface is close to the frequency of the front and rear top crossbeams of the vehicle body, which can easily lead to resonance, thus creating a strong low-frequency pressure sensation in the ears and affecting the driving experience. Currently, a common solution is to add mass blocks inside the cross-section of the front and rear top crossbeams. The weight is usually in the range of 1kg-3kg. The purpose is to reduce the local modes of the top crossbeams through the action of the mass blocks, avoid the low-frequency excitation range, and thus improve the low-frequency road noise response.

[0003] A patent application (patent number 201920607471.7, published on January 14, 2020) discloses a dynamic vibration absorber, comprising a base block, a high-leg nut, a stud, a rubber block, and a mass block. A stud is centrally located on the upper surface of the base block, and a high-leg nut is mounted on the stud, with the high-leg nut in contact with the upper surface of the base block. A rubber block is connected to the lower surface of the base block, and a mass block is connected to the lower surface of the rubber block. This dynamic vibration absorber can withstand harsh working environments of chassis components and maintains structural stability even under high-amplitude operating conditions. It can also eliminate vibrations at the structural source of road noise, thereby reducing noise transmitted into the vehicle and improving the vehicle's NVH performance.

[0004] The current method carries the risk of causing abnormal noises throughout the vehicle. There are two main reasons for this. First, when the cross section of the top crossbeam is small, some irregularly shaped metal weights are arranged in the cavity, which can easily interfere with the upper and lower sheet metal and cause abnormal noises. Second, these metal weights are usually bolted to the inner plate of the top crossbeam. These positions happen to be the response positions for low-frequency vibrations. During long-term driving, the torque of the mounting bolts will decrease, the nuts will loosen, and the entire metal counterweight will shake and cause abnormal noises from the inner and outer plates. Utility Model Content

[0005] The present invention aims to provide a top crossbeam structural reinforcement component that can effectively reduce interference noise between the mass block and the sheet metal and improve the low-frequency road noise of the whole vehicle.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a top crossbeam structural reinforcement for improving low-frequency road noise of the whole vehicle, comprising a mass block, a nylon skeleton and structural adhesive, wherein the nylon skeleton covers the outside of the mass block and the structural adhesive is disposed on the surfaces of both sides of the nylon skeleton.

[0007] The nylon skeleton has arch-shaped adhesive coating grooves on both sides, and the structural adhesive is coated inside the adhesive coating grooves.

[0008] The adhesive coating trough is divided into a front trough and a rear trough. The surface of the front trough is provided with a corrugated groove that matches the inner wall surface of the top crossbeam. The surface of the rear trough is arc-shaped and matches the shape of the inner wall surface of the top crossbeam.

[0009] The nylon skeleton is equipped with buckles that cooperate with the top crossbeam.

[0010] The nylon skeleton is provided with a U-shaped reinforcing plate, which is located on the inner side of the rear groove plate.

[0011] The inner side of the rear groove plate is provided with an edge plate.

[0012] The mass block is positioned between the sheet metal panels on both sides of the top crossbeam.

[0013] The nylon skeleton has a groove, and the edge of the groove has an outward protrusion plate.

[0014] The technical advantages of this invention are as follows: The metal mass block is encased inside a nylon skeleton, with epoxy resin structural adhesive injected onto the outside. This adhesive provides a stable bond to the top crossbeam sheet metal. Compared to the reduced preload when simply connecting the mass block to sheet metal with bolts, this effectively avoids the risk of abnormal noise from the mass block. Furthermore, the mass block is installed in locations where low-frequency vibrations of the sheet metal are most intense. Due to its conformal design, the mass block's surface can experience dry friction and abnormal noise when traversing bumpy roads. The embedded mass block structural reinforcement completely encapsulates the mass block within the nylon, and the large-area epoxy resin structural adhesive on the outside of the nylon surface allows for extensive bonding with the inner and outer sheet metal of the top crossbeam, preventing localized abnormal noise. Besides the top crossbeam, other large covering components, such as the tailgate assembly, also contribute significantly to low-frequency road noise. The embedded mass block structural reinforcement is also suitable for this cavity location and can be widely adopted. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following:

[0016] Figure 1 This is a structural schematic diagram of a top crossbeam reinforcement component for improving low-frequency road noise in a vehicle, according to the present invention.

[0017] Figure 2 for Figure 1 A schematic diagram of a mass block for a top crossbeam structure reinforcement component that improves low-frequency road noise in a vehicle;

[0018] Figure 3 for Figure 1 A schematic diagram of the positive channel plate of a top crossbeam structure reinforcement component for improving low-frequency road noise in a vehicle;

[0019] Figure 4 for Figure 1 A schematic diagram of the rear groove plate of a top crossbeam structure reinforcement component for improving low-frequency road noise in a vehicle;

[0020] Figure 5 for Figure 1 A schematic diagram of the snap-fit ​​assembly of a top crossbeam structural reinforcement component for improving low-frequency road noise in a vehicle;

[0021] Figure 6 for Figure 1 A schematic diagram of the top crossbeam assembly for a top crossbeam structural reinforcement component that improves low-frequency road noise in a vehicle.

[0022] The markings in the diagram are: 1. Mass block; 2. Nylon skeleton; 3. Structural adhesive; 4. Adhesive coating groove plate; 41. Front groove plate; 42. Rear groove plate; 5. Buckle; 6. U-shaped reinforcing plate; 7. Edge plate; 8. Groove; 9. Outer protrusion plate; 10. Top crossbeam. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0024] Please see Figure 1-6 A top crossbeam structural reinforcement component for improving low-frequency road noise in a vehicle includes a mass block 1, a nylon skeleton 2, and structural adhesive 3. The nylon skeleton 2 covers the outside of the mass block 1, and the structural adhesive 3 is applied to the surfaces of both sides of the nylon skeleton 2. By covering the outside of the metal mass block 1 with a layer of nylon skeleton 2 and injecting epoxy resin structural adhesive 3 onto the nylon skeleton 2, the structural adhesive 3 is stably bonded to the sheet metal of the top crossbeam 10. Compared with the preload attenuation when the mass block 1 is simply connected to the sheet metal with bolts, this effectively avoids the risk of abnormal noise from the mass block 1. At the same time, the installation position of the mass block 1 is in a location where the sheet metal vibrates violently at low frequencies. The mass block 1 is designed to conform to its shape. When driving over bumpy roads, the surface of the mass block 1 will cause dry friction noise with the deformed sheet metal. The embedded structural reinforcement component completely covers the mass block 1 within the nylon, and the epoxy resin structural adhesive 3 on the outside covers a large area of ​​the nylon surface, which can achieve large-area bonding with the inner and outer sheet metal of the top crossbeam 10, avoiding localized abnormal noise.

[0025] The nylon skeleton 2 has arch-shaped adhesive application grooves 4 on both sides, and structural adhesive 3 is applied in the adhesive application grooves 4. The adhesive application grooves 4 can effectively store the structural adhesive 3 and prevent it from overflowing. At the same time, the arch-shaped adhesive application grooves 4 can ensure the area of ​​adhesive application, ensure the adhesion strength, prevent detachment and abnormal noise, and also increase the uniformity of adhesion, so as to ensure the stable adhesion of the nylon skeleton 2 as much as possible, and avoid the situation where the adhesion strength is different in different areas due to irregular adhesive application areas, resulting in partial detachment.

[0026] The adhesive application tray 4 is divided into a front tray 41 and a rear tray 42. The surface of the front tray 41 is provided with a corrugated groove that matches the inner wall surface of the top crossbeam 10. The surface of the rear tray 42 is arc-shaped and matches the shape of the inner wall surface of the top crossbeam 10. The shapes of the surfaces of the front tray 41 and the rear tray 42 are adapted to the shape of the inner wall of the top crossbeam 10, matching the profile of the sheet metal. The gap between the surfaces of the front tray 41 and the rear tray 42 and the sheet metal of the top crossbeam 10 is 6mm. On the basis of 6mm, a 3mm thick structural adhesive 3 is arranged in the adhesive application tray 4. After being heated in the drying oven, the 3mm structural adhesive 3 heats up and expands to 3mm, thereby bonding with the sheet metal of the top crossbeam 10. Based on the sheet metal profile design of the top crossbeam 10, the main purpose is to ensure that the structural adhesive 3 and the sheet metal of the top crossbeam 10 are bonded evenly and uniformly, avoiding problems such as poor bonding or no bonding due to large gaps.

[0027] The nylon skeleton 2 is equipped with a buckle 5 that cooperates with the top crossbeam 10; the buckle 5 is used to position and pre-install the sheet metal of the top crossbeam 10, which plays a preliminary fixing role. The buckle 5 is conical and consists of a cylindrical structure in the middle and a circumferential spring piece set at the end of the cylinder.

[0028] The nylon skeleton 2 is provided with a U-shaped reinforcing plate 6, which is located inside the rear groove plate 42. The U-shaped reinforcing plate 6 protrudes from the surface of the nylon skeleton 2 and is a kind of vertical rib on the nylon skeleton 2. It is used to prevent the structural adhesive 3 from overflowing during the foaming process and to prevent the edge from clogging the hole.

[0029] The inner side of the rear groove plate 42 is provided with an edge plate 7 to prevent the structural adhesive 3 from overflowing during the foaming process and to prevent the edge from clogging the hole.

[0030] Mass block 1 is positioned between the sheet metal on both sides of the top crossbeam 10. Mass block 1 is in a concentrated mass state within the sheet metal cavity, which reduces the modality of the top crossbeam 10 and improves the road noise response. This design can effectively avoid the risk of abnormal noise.

[0031] The nylon skeleton 2 has a groove 8, and the edge of the groove 8 has an outward protrusion 9 to prevent the structural adhesive 3 from overflowing.

[0032] The surface roughness of mass block 1 must meet the requirements of the nylon injection molding process, and the surface of metal mass block 1 is galvanized to meet the requirements of sealing and corrosion protection. The pre-processed metal mass block 1 is placed in the mold as an insert. The positioning accuracy between metal mass block 1 and the mold is ensured by pre-drilled positioning holes. Then, the nylon particles are heated and become molten and flow in the mold for injection molding. The nylon material will completely cover the surface of metal mass block 1, and other structural features will be completed. After cooling and solidification, the nylon-coated mass block 1 semi-finished part is completed. The surface of the nylon mass block 1 semi-finished part is coated with epoxy resin. Through the injection molding process, the semi-finished part is placed in the injection mold. Epoxy resin structural adhesive 3 particles During the heating and melting process, and mold closing, flowing particles are injected onto the nylon surface to complete the final product processing. During installation, the product's reinforcing parts are fastened to the sheet metal round holes of the top crossbeam 10 by two injection-molded nylon clips 5. Then, the inner and outer sheet metals are joined together and welded to complete the product's installation process. The already fastened embedded mass block 1 reinforcing parts are installed in the inner and outer sheet metal cavities. After the car body undergoes electrophoresis coating and is heated in the drying oven, the outermost epoxy resin structural adhesive 3 foams at high temperature and bonds to the inner and outer sheet metals. After exiting the drying oven, during the cooling process of the car body, the epoxy resin structural adhesive 3 cools and cures simultaneously, bonding stably to the sheet metal, thus completing the entire product's process route.

[0033] The technical advantages of this invention are as follows: The metal mass block 1 is encased inside the nylon skeleton 2, and the outer side is injection-molded with epoxy resin structural adhesive 3. It is stably bonded to the sheet metal of the top crossbeam 10 through the adhesive. Compared with the preload reduction when the mass block 1 is simply connected to the sheet metal with bolts, it can effectively avoid the risk of abnormal noise from the mass block 1. At the same time, the installation position of the mass block 1 is in the position where the sheet metal vibrates violently at low frequency. The mass block 1 is designed to conform to the shape. When passing over bumpy roads, the surface of the mass block 1 will cause dry friction and abnormal noise with the deformed sheet metal. The embedded mass block 1 structural reinforcement completely encapsulates the mass block 1 inside the nylon, and the outer epoxy resin structural adhesive 3 covers a large area of ​​the nylon surface, which can achieve a large-area bonding with the inner and outer sheet metal of the top crossbeam 10, avoiding local abnormal noise. In addition to the top crossbeam 10, the low-frequency road noise of the whole vehicle also includes some large covering parts, such as the tailgate assembly. The front and rear breathing modes also contribute significantly to the low-frequency road noise. The embedded mass block 1 structural reinforcement is also applicable to this cavity position and can be promoted.

[0034] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A top crossbeam structural reinforcement component for improving low-frequency road noise in a vehicle, characterized in that: It includes a mass block (1), a nylon skeleton (2) and structural adhesive (3), wherein the nylon skeleton (2) covers the outside of the mass block (1) and the structural adhesive (3) is disposed on the surfaces of both sides of the nylon skeleton (2).

2. The top crossbeam structural reinforcement for improving low-frequency road noise in a vehicle according to claim 1, characterized in that: The nylon skeleton (2) has arch-shaped adhesive grooves (4) on both sides, and the structural adhesive (3) is coated inside the adhesive grooves (4).

3. The top crossbeam structural reinforcement for improving low-frequency road noise in a vehicle according to claim 2, characterized in that: The adhesive coating trough plate (4) is divided into a front trough plate (41) and a rear trough plate (42). The surface of the front trough plate (41) is provided with a wave groove that matches the inner wall surface of the top crossbeam (10). The surface of the rear trough plate (42) is arc-shaped and matches the shape of the inner wall surface of the top crossbeam (10).

4. A top crossbeam structural reinforcement for improving low-frequency road noise in a vehicle according to claim 2, characterized in that: The nylon skeleton (2) is provided with a buckle (5) that cooperates with the top crossbeam (10).

5. A top crossbeam structural reinforcement for improving low-frequency road noise in a vehicle according to claim 3, characterized in that: The nylon skeleton (2) is provided with a U-shaped reinforcing plate (6), which is located on the inner side of the rear groove plate (42).

6. A top crossbeam structural reinforcement for improving low-frequency road noise in a vehicle according to claim 3 or 5, characterized in that: The inner side of the rear groove plate (42) is provided with an edge plate (7).

7. A top crossbeam structural reinforcement for improving low-frequency road noise in a vehicle according to claim 1, characterized in that: The mass block (1) is positioned between the sheet metal on both sides of the top crossbeam (10).

8. A top crossbeam structural reinforcement for improving low-frequency road noise in a vehicle according to claim 1, characterized in that: The nylon skeleton (2) is provided with a groove (8), and the edge of the groove (8) is provided with an outward protrusion plate (9).

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